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首页> 外文期刊>Journal of Plant Physiology >Differential response of antioxidant systems in leaves and roots of barley subjected to anoxia and post-anoxia
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Differential response of antioxidant systems in leaves and roots of barley subjected to anoxia and post-anoxia

机译：大麦叶片和根系抗氧化系统在缺氧和缺氧后的差异响应

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Mitochondria and chloroplasts are the primary sources of reactive oxygen species in photosynthetic tissues. Mitochondria play a dual role in oxidative stress, being both ROS producers and integrators of the cell antioxidant defense systems. Anoxia followed by re-exposure to air may create conditions of elevated ROS generation in plants.The reactions of barley leaves and root antioxidant systems after anoxia were investigated. Alternative oxidase and low-mass antioxidants showed different patterns of change in leaves and roots in response to changing oxygen availability. Mitochondria from leaves showed a reduced AOX capacity and AOX protein level during post-anoxia, while the AOX capacity in root mitochondria increased. In leaf tissue, ascorbate and glutathione were immediately oxidized after restoration of aerobiosis due to the enhanced ROS production, whereas in roots ascorbate and glutathione became even more reduced. The capacity of antioxidant systems was not exceeded in either leaf or root tissue after anoxia; no signs of oxidative damage were observed and the respiratory activity of mitochondria was retained. We suggest that the leaf and root cell antioxidant systems react differentially to changes in oxygen concentration. In leaves, low-mass antioxidants play the major role in ROS detoxification, while in roots, increased AOX capacity supports the antioxidant systems, possibly by preventing ROS formation.
机译：线粒体和叶绿体是光合组织中活性氧的主要来源。线粒体在氧化应激中起着双重作用，既是ROS的产生者又是细胞抗氧化剂防御系统的整合者。缺氧然后再暴露于空气中可能会导致植物中ROS生成增加的条件。研究了缺氧后大麦叶片和根系抗氧化剂系统的反应。替代的氧化酶和低质量抗氧化剂显示出响应于可用氧量变化的叶和根变化方式。缺氧后叶片的线粒体显示出降低的AOX容量和AOX蛋白水平，而根线粒体中的AOX容量增加。在叶片组织中，由于ROS产生的增加，抗坏血酸和谷胱甘肽在氧合恢复后立即被氧化，而在根部，抗坏血酸和谷胱甘肽变得更加减少。缺氧后叶或根组织中抗氧化剂系统的能力均未超过;没有观察到氧化损伤的迹象，并且线粒体的呼吸活性得以保留。我们建议叶和根细胞的抗氧化剂系统对氧气浓度的变化有不同的反应。在叶片中，低质量抗氧化剂在ROS解毒中起主要作用，而在根部，增加的AOX容量可能通过防止ROS形成来支持抗氧化剂系统。

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